Date: Fri, 1 Sep 2000 12:25:36 +0930 From: Greg Lehey <grog@lemis.com> To: John Turner <john@drexeltech.com>, freebsd-questions@FreeBSD.ORG Subject: Re: Tagged Queueing question Message-ID: <20000901122536.B5586@wantadilla.lemis.com> In-Reply-To: <20000831131350.F2264@absinthe.condo.chico.ca.us>; from fred@condo.chico.ca.us on Thu, Aug 31, 2000 at 01:13:50PM -0700 References: <4.3.2.7.0.20000830083308.00b197f8@mail.johnturner.com> <20000831104349.E29115@wantadilla.lemis.com> <20000831131350.F2264@absinthe.condo.chico.ca.us>
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On Thursday, 31 August 2000 at 13:13:50 -0700, Fred Condo wrote: > On Thu, Aug 31, 2000 at 10:43:49AM +0930, Greg Lehey wrote: >> On Wednesday, 30 August 2000 at 8:35:41 -0400, John Turner wrote: >>> >>> This message showed up in one my server's security check output >>> today. I've never seen it before. Is it something I need to worry >>> about? The server was rebooted yesterday, after about 2 months of uptime. >>> >>>> da1 at ahc0 bus 0 target 2 lun 0 >>>> da1: <IBM DNES-309170W SAH0> Fixed Direct Access SCSI-3 device >>>> da1: 80.000MB/s transfers (40.000MHz, offset 30, 16bit), Tagged Queueing Enabled >>>> da1: 8748MB (17916240 512 byte sectors: 255H 63S/T 1115C) >> >> Tagged queueing is a technique where the driver issues multiple >> requests to the controller, and the controller automatically continues >> with the next request after finishing the first, without needing >> intervention by the driver. This improves performance. There's >> nothing to worry about. > > Unless you have certain seagate drives. There was a discussion of > seagate firmware bugs recently on -questions or -stable. That bug bit > me until I disabled write-through on the scsi bios and used camcontrol > to turn off tagged queueing at boot time. The original questioner's > IBM drive should be okay AFAIK. This is a separate issue. Yes, some drives have broken tagged queueing. Greg -- When replying to this message, please copy the original recipients. For more information, see http://www.lemis.com/questions.html Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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